Specifically, a mosquito that comes into your bed at three in the morning and can not be cast out.
"Those damn beelzebugs have been biting me all day!" shouted Roger as he scratched madly. "I hate them."
(Beelzebug comes from a make-a-new-word contest in a newspaper. It comes from Beelzebub, the name of a character in "Paradise Lost" who is ranks right below Satan in Hell.)
Information Agetechnology that has diabolic or infernal applications, especially if it can be interpreted as prophecied in the The Book of Revelations.
"While many Americans, including many Christians, joke about the Rapture, End Times and now the illicit use of RFID implants--the word Beelzebugs suddenly comes to mind--there are, by Mr. O'Leary's account, 'tens of millions' who don't consider RFID the stuff of mirth." - From the Online Wall Street Journal, 2005.12.30
Alter ego of the late, great comedian Bill Hicks. A bit in which he said he was available for children's parties as an evil clown.
Beelzebozo: Hi, kids, it's Beelzebozo time! Tell me something, who here outta you young'uns has never...watched a skin flick? C'mere, Tommy! See them? Them's titties, hoo-hoo!